WASHINGTON (AP) — Backers of a narrowly drawn budget deal are selling it as a way to stabilize Congress' shaky fiscal practices and mute some of the partisan rancor that has helped send lawmakers' public approval ratings plummeting. But the bipartisan pact doesn't solve long-term tax and spending issues, leaving liberals and conservatives alike grumbling.

House and Senate floor votes are being sought on the plan announced Tuesday by Republican Rep. Paul Ryan and Democratic Sen. Patty Murray, and applauded by the White House, with the aim of securing passage before lawmakers go home for the holidays.

But skepticism surfaced in both the Democratic and Republican caucuses.

Sen. Tom Coburn, an Oklahoma Republican and leading deficit hawk, panned the new deal in an interview Wednesday, saying it fails to address core issues of wasteful spending in Washington. He said it was probably "the best" that Ryan and Murray could get at this time. But said he was disappointed in its failure to address core fiscal issues such as duplication and wasteful spending in Washington.

The agreement, among other things, seeks to restore $63 billion in automatic spending cuts affecting programs ranging from parks to the Pentagon. The deal to ease those cuts for two years is aimed less at chipping away at the nation's $17 trillion national debt than it is at trying to help a dysfunctional Capitol stop lurching from crisis to crisis. It would set the stage for action in January on a $1 trillion-plus spending bill for the budget year that began in October.

The measure unveiled by Ryan, R-Wis., and Murray, D-Wash., blends $85 billion in spending cuts and revenue from new and extended fees — but no taxes or cuts to Medicare beneficiaries — to replace a significant amount of the mandated cuts to agency budgets over the coming two years.

The package would raise the Transportation Security Administration fee on a typical nonstop, round-trip airline ticket from $5 to $10; require newly hired federal workers to contribute 1.3 percentage points more of their salaries toward their pensions; and trim cost-of-living adjustments to the pensions of military retirees under the age of 62. Hospitals and other health care providers would have to absorb two additional years of a 2-percentage-point cut in their Medicare reimbursements.

The plan doesn't attempt to resuscitate earlier attempts at an accommodation that would have traded tax hikes for structural curbs to ever-growing benefit programs like Medicare and Social Security. But it would at least bring some stability on the budget to an institution — Congress — whose approval ratings are in the gutter.

"Our deal puts jobs and economic growth first by rolling back ... harmful cuts to education, medical research, infrastructure investments and defense jobs for the next two years," Murray said.

Ryan is set to pitch the measure to skeptical conservatives at a closed-door GOP meeting on Wednesday. Democrats are set to discuss it as well, but the measure won an immediate endorsement from President Barack Obama if only tepid approval from top Capitol Hill Democrats like House Minority Leader Nancy Pelosi and Rep. Chris Van Hollen, ranking Democrat on the Budget Committee.

"Tonight's agreement represents a step toward enacting a budget for the American people and preventing further manufactured crises that only harm our economy, destroy jobs and weaken our middle class," Pelosi said in a statement.

"This agreement makes sure that we don't have a government shutdown scenario in January. It makes sure that we don't have another government shutdown scenario in October," Ryan said. "It makes sure that we don't lurch from crisis to crisis."

The budget deal was one of a few major measures left on Congress' to-do list near the end of a bruising year that has produced a partial government shutdown, a flirtation with a first-ever federal default and gridlock on Obama's agenda.

In a blow to Democrats, the agreement omits an extension of benefits for workers unemployed longer than 26 weeks. The program expires Dec. 28, when payments will be cut off for an estimated 1.3 million individuals. Senate Majority Leader Harry Reid, D-Nev., has agreed to stage a test vote on the measure this year, but it's not clear whether he'll get enough GOP support to advance it.

Aides predicted bipartisan approval in both houses in the next several days, despite grumbling from liberals over the omission of the unemployment extension and pressure from tea party-aligned groups that are pushing Republican conservatives to oppose the deal.

The agreement would increase the cap on so-called discretionary spending from the $967 billion mandated by Washington's failure to follow up a 2011 budget agreement with additional deficit cuts. The cap would rise to $1.012 trillion for the ongoing 2014 budget year and up to $1.014 trillion for 2015.

The relief to the Pentagon is relatively modest since the agency started out facing a cut of $20 billion below the harsh cuts it faced in 2013; the agreement replaces those cuts but doesn't bring the military's budget much above 2013 levels.

Even before the deal was announced, conservative organizations were attacking the proposal as a betrayal of a 2011 agreement that reduced government spending and is counted as among the main accomplishments of tea party-aligned Republicans who came to power earlier the same year in the House.

Sen. Marco Rubio, R-Fla., issued a statement opposing the measure and Senate Minority Leader Mitch McConnell, R-Ky., was seen as likely to oppose it as well. But key Democrats lined up behind Obama, especially after Ryan eased demands on making federal workers contribute more to their pensions.

"This agreement isn't perfect, but it is certainly better than no agreement at all," said Van Hollen, the top House Budget Committee Democrat.

Coburn made his remarks in an appearance Wednesday on MSNBC.

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